Moving more toward perennial/herbaceous planting

Actually that is very much the old name. It was a subspecies of Allium back then but the taxonomists then moved it into Allium proper.

http://www.kew.org/science-conservation/plants-fungi/allium-siculum-sicilian-honey-garlic

 

I thought Nectaroscordum was a sub species of allium to which it had recently been moved. Seems the RHS contradicts itself. It doesn't really matter so long as anyone looking for it knows it seems to go under two names.

www.rhs.org.uk/plants/details?plantid=1320

 

Very much easy to find: Tescos!!!

 

For the back of a border, I think Verbena bonariensis is excellent value for money. A tall plant (2m) with a long flowering period. The flowers are actually quite small in proportion to the height of the plant but it does give a good splash of colour.

This is the flower head



and this is the plant in situ



It can look a little straggly, but that is because the shrubs and climbers haven't reached maturity yet.

 

This is very to easy to find down here as I know of at least one place where it has naturalised in a damp verge and is an impressive sight in spring.
To me the bruised foliage smells of burning tyres, I grew it in a well drained sunny spot for some years until it tried to take over. I now grow N tripedale which I think is somewhat nicer, flowers are more numerous and pinker. It still has the same smell when bruised and doesn't seem inclined to spread as much.